Installation & Operation Manual 740 Document # LTRT-92224
Mediant 8000
43.8 Determining Source and Destination URL
The SIP protocol has more than one URL in a dialog establishing request that might
represent the source and destination URL. When handling an incoming request, the
device determines which SIP headers are used for source and destination URL's.
Once these URL's are determined, the input user and host are taken from these
URLs.
INVITE dialogs:
• Source URL: if exists, obtained from the P-Asserted\Preferred-Identity
header; otherwise, from the From header
• Destination URL: obtained from the Request URI
REGISTER dialogs:
• Source URL: obtained from the To header
• Destination URL: obtained from the Request URI
43.9 Source IP Group Classification
The SBC application performs a classification process to associate the incoming SIP
request with a specific IP Group. Once determined, this IP Group is used for the
following purposes:
Input for the SBC manipulation and routing processes
Definition of SIP behavior via the IP Profile, Media Realm and Account
The classification begins by matching the incoming SIP request with the Registrations
Database.
If the registration database search is unsuccessful, the classification proceeds with
locating a Proxy Set (associated with the SIP dialog request's IP address) and then
searches for a match with a IP Group in the IP Groups table. Each IP Group can be
classified according to its Proxy Set (if the parameter Classify By Proxy Set in IP
Group is set to enabled). Note that this classification is not relevant in cases where
multiple IP Groups use the same Proxy Set.
If the classification based on the Proxy Set is unsuccessful, the device proceeds to the
SBC Classification table, where it searches for a source IP Group based on the
following matching rules: Source IP Address, Source Username Prefix, Source Host
Prefix, Destination Username Prefix, Destination Host and Source SRD.
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